More than 30 bodies have been recovered, two sources told NBC News, and a frantic search and rescue mission to find crash victims in the icy Potomac river remains underway.

Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery mission is underway.

A passenger plane with 64 people on board was landing at the Ronald Reagan Washington National Airport at the time of the crash with the military aircraft, which had three soldiers on board.